Railway signaling system



Dec. 5, 1939. A. BROWN 2,182,170

RAILWAY S IGNALING SYSTEM Filed Feb. 23, 1938 av Awake/vi;

Patented Dec. 5, 1939 UNiTED STATES 2,182.,llii

PATENT OFFICE ternational New York, N. Y.

Standard Electric Corporation.

Application February 23, 1938, Serial No. 192,079 In Great Britain March 25, 1937 2 Claims.

This invention relates to axle-counting equipment for the control of railway signals and/or points.

The object of the invention is to arrange the 5 axle-counting equipment to respond to very short impulses from the wheel-operated contacts, so that either clipped impulses will not be lost or the treadles can be designed to give very short impulses with consequent improvement in the treadle operation at high speeds.

According to the main feature of the invention, a treadle-controlled relay is arranged to remain in the condition it assumes in response to the operation of the treadle until the axlecounting device has fully responded to the treadle operation even after the treadle has returned to normal position.

The invention will be clearly understood from the following description of one embodiment shown in the accompanying drawing the single figure of which shows sufiicient of the circuits of an axle-counting equipment to illustrate the v If contacts T close before CM is fully operated, relay TRA cannot yet re-energise since it is shortcircuited via trzn INT.

When CM is energised fully, contacts INT open. If, or when contacts T as closed, TRA energises, 5 since the short-circuit is now open at INT. Contacts tral, traz open and magnet CM releases, stepping the counting device.

What is claimed is:

1. Axle-counting equipment comprising a relay, 10 treadle controlled contacts for normally maintaining said relay energised, a normally de-energised counting magnet, normally closed counting contacts arranged to be opened by complete energisation of said counting magnet, contacts con- 15 I trolled by said relay for completing an energising circuit for said counting magnet in response to de-energisation of said relay, and means comprising said counting contacts for maintaining said relay ole-energised, in response to an opening 20 of said treadle controlled contacts, until said counting magnet has become fully energised even after a reclosure of said treadle controlled contacts.

2. Axle-counting equipment according to claim 1, in which said last named means comprises, a second pair of contacts controlled by said relay connected in series with said counting contacts, said second pair of contacts being closed in response to de-energisation of said relay, and connections to said second pair of contacts and said counting contacts forming a short circuiting shunt around said relay.

- ANDREW BRO'WN. 

